Composition of Matter
What is an element
a classification for atoms found on the periodic table
What did Rutherford's gold experiment prove
discovered the nuclear model of an atoms
What is a compound
two or more chemical elements bonded together
State of a solid
Definite volume
What is a hypothesis
A tentative explanation of observations
What did Milikan's oil drop experiment prove
(a very little negative charge)
What is the law of conservation of mass
Mass cannot be created or destoryed
What is a homogeneous substance
a substance consisting of two or more elements with a uniform pattern throughout its volume
State of a liquid
Definite volume
What is a theory
Model for the way nature works
What are the four main points of Dalton's atomic theory
Matter is made up of small, indestructible atoms
All atoms of a given element have the same mass and other properties
Atoms combine in simple, whole-number ratios
Atoms of one element can not change into atoms of another element
What is the law of definite proportions
A chemical compound always contains the same elements in the same proportions
What is a heterogeneous mixture
a substance with two or more elements that has variable uniform throughout its volume
State of a gas
Indefinite shape
Indefinite volume
What is a law
Brief statement summarizing past observations and predicting future ones
What did JJ Thompsons cathode ray prove
the existence of electrons
(also brought about the plum pudding model)
What is the law of multiple proportions
When two elements form two different compounds, the masses of one element that combine with a fixed mass of the other element are in the ratio of small whole numbers